Spring-tooth harrow



- (No Model.)

F. E. CHURCH.- SPRING TOOTH HARROW.

WITNESSES INVENTOR ATTORNEY away, showing the swiveled attachment ofUNITED STATES PATENT OFFICE.

FRANCIS E. CHURCH, OF KALAMAZOO, MICHIGAN.

SPRING-TOOTH 'HARROW.

SPFCIFICATION forming part of Letters Patent No. 423,218, dated March11, 1890.

' Application filed November 16, 1889. Serial No. 330,554. (No model.)

fication, Figure 1 is a plan view. Fig. 2 is an enlarged end elevationof one of the toothbars in Fig. 1 and side elevation of one of the teethattached thereto. Fig. 3 is a section on line 1 1 in Fig. 2, lookingfrom a point at the right. Fig. 4 is a cross-section on line 3 3 in Fig.2, looking from a point above; and Fig. 5 showsenlarged lettered detailsfrom Fig. 1.

At A are shown the tooth-bars of the harrowframe.

The frame as here shown consists of three sections, as in Fig. 1, eachsection being joint edly connected together by the links and the clevisE E, said links being connected in a vswiveled manner, as in Fig. 1, butmore clearly illustrated in Fig. 5, in which figure a portion of theright-hand clevisE Eis broken one of the links it to said clevis. Bythis 'means the sections of the frame can tilt up and down endwise andsidewise, according to the varying contour of the surface of the soil.These sections are attached by draw-bars F to the long bar C, and tosaid bars as many whiflietrees may be attached as desired, according tothe number of horses used. (No Whiffletrees are here shown.)

The barrow-tooth is made out of a round rod of spring metal, having ashank which is attached to the beam A by the staple-bolt D, Figs. 2 and3, said shank having an angled end 6 catching over the front side of thebeam A. Back of the shank the rod is bent to form a loop H, and fromsaid loop the remainder of the tooth is C-shaped or curved, as in Fig.2. Y

The working end of the tooth is hammered or pressed so as to have threesides, and hence triangular in shape in cross-section, as in Fig. 4,thus presenting one of the apexes of two of the converging sides to thefront. This makes a strong tooth with sufficient elasticity out oflightweight metal, and a tooth that easily cuts its Way through thesoil.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent of the United States, is

The round metal harrowtooth having. its working end below theelastic-bowed body pressed or hammered, so as to make said end solid andtriangular in cross section, sub stantially as set forth.

In testimony of the foregoing I have hereunto subscribed myname inpresence of two witnesses.

' FRANCIS. E. CHURCH.

Witnesses:

BELLE FREEMAN, L. N. BURKE.

